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Employee Stock-based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation Expense | The Company recorded stock-based compensation expense for the years ended December 31 as follows:
In millions | 2020 |  | 2019 |  | 2018
Stock options | $ | 1 |  |  | $ | 3 |  |  | $ | 6 |
Restricted shares | 98 |  |  | 77 |  |  | 56 |
Employee share repurchase program | 2 |  |  | 3 |  |  | 3 |
Total stock-based compensation before income taxes | 101 |  |  | 83 |  |  | 65 |
Tax benefit | (5) |  |  | (10) |  |  | (11) |
Total stock-based compensation, net of tax | $ | 96 |  |  | $ | 73 |  |  | $ | 54 |
Restricted Stock and Restricted Stock Unit Activity | The following table reports restricted shares and restricted share unit activity during the year ended December 31, 2020:
Shares in thousands | Number of Shares |  | Weighted- Average Grant Date Fair Value per Share
Unvested shares at January 1, 2020 | 5,169 |  |  | $ | 40.95 |
Granted | 6,145 |  |  | $ | 20.74 |
Vested | (2,100) |  |  | $ | 37.19 |
Forfeited/canceled | (1,702) |  |  | $ | 31.74 |
Unvested shares at December 31, 2020 | 7,512 |  |  | $ | 27.00 |
Weighted-Average Fair Value and Total Fair Value of Shares Vested | The following table summarizes the weighted-average fair value of restricted share units granted for Teradata equity awards and the total fair value of shares vested.
| 2020 |  | 2019 |  | 2018
Weighted-average fair value of restricted share units granted | $ | 20.74 |  |  | $ | 44.13 |  |  | $ | 37.98 |
Total fair value of shares vested (in millions) | $ | 80 |  |  | $ | 41 |  |  | $ | 53 |
The Composition of Teradata Restricted Stock Grants | The following table represents the composition of Teradata restricted share unit grants in 2020:
Shares in thousands | Number of Shares |  | Weighted- Average Grant Date Fair Value
Service-based shares | 5,570 |  |  | $ | 20.75 |
Performance-based shares | 575 |  |  | $ | 20.68 |
Total stock grants | 6,145 |  |  | $ | 20.74 |
Employee Purchases and Aggregate Cost | Employee purchases and aggregate cost were as follows at December 31:
In millions | 2020 |  | 2019 |  | 2018
Employee share purchases | 0.7 |  |  | 0.6 |  |  | 0.5 |
Aggregate cost | $ | 14 |  |  | $ | 20 |  |  | $ | 17 |

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